Lead Oxides

Lead Oxides

 

the chemical compounds of lead and oxygen: Pb2O, PbO, PbO2, Pb3O4, and Pb2O3. Lead oxide (PbO), peroxide (PbO2), and red oxide, also called minium (Pb3O4), are of commercial value. The oxide PbO has the two crystal forms yellow red tetragonal α (massicot) and yellow orthorhombic β (litharge), with a transition point of 587°C. Both forms are poorly soluble in water (0.11 and 0.05 g per liter at 25°C) and have a melting point of 836°C. PbO is amphoteric, with predominantly basic properties. It is obtained through the oxidation of melted Pb with atmospheric oxygen, as well as through the thermal dissociation of lead hydroxide, carbonate, or nitrate. When heated in air (up to 400°–500°C), PbO converts to Pb3O4, an oxide with red tetragonal crystals. PbO2, which has brown tetragonal crystals, is obtained upon interaction of red oxide and nitric acid. Lead peroxide is a strong oxidizing agent; when triturated with powdery sulfur or red phosphorus, it ignites even at room temperature.

PbO is used in the manufacture of lead glass and glazes; PbO2 serves as an oxidizing agent in the chemical industry and in the manufacture of lead batteries; and Pb3O4 is used in the preparation of paints that protect metals from corrosion.

References in periodicals archive ?
In terms of benefits, Arafat explained that there are several advantages to the octane 87 petrol, for example, it reduces the rates of air pollution and reducing the percentage of lead oxides in the air.
During the detonation, this oil would be exposed anywhere from 3,000 F to 7,000 F and a chemical reaction would take place that could create some lead components, such as lead oxides, which is a solid at normal state and has a boiling point of about 2,700 F.
Hammond's business is producing lead oxides and negative plate expanders in service to the world's battery industry.
In 2013, Sri Lanka's leading exports to Iran were tea, coconuts, cashew nuts, coconut fibre, lead oxides and apparel while main imports from Iran were plastics, electrical transformers, Insulated wire and cable, and bulldozers.
Incom creates fused fiber optics -- glass tubes used in X-ray devices, night-vision goggles, and much more -- using materials that contain a small amount of lead oxides.
New binary borate base glasses added with bismuth and lead oxides were successfully prepared and their structures were analyzed by ultrasonic waves.
These observations are in agreement with the data of X-ray diffraction that the upper layer may be related to [In.sub.2][O.sub.3] and In[(OH).sub.3], while the underneath layer contains lead oxides. It is very interesting to observe that PbS[O.sub.4] completely disappeared on the surface of alloy V (15% In) compared with that observed in both Pb and Pb-0.5% In alloy.
The rock containing the gold also contained lead oxides. When the stones were crushed to get at the gold, the airborne dust poisoned the children.
[16] Ruetschi, P., Sklarchuk, J., Argstadit, R.T., 1963, "Stability and Reactivity of Lead Oxides," Electrochimica.
While the move to unleaded fuel products has removed the health hazards associated with lead oxides in the air, however the black fumes emanating from diesel driven trucks, buses and vans still need to be dealt with if we are to expect a clean bill of health for the air in Amman and other cities in Jordan.
The term Majolica refers to a specific type of glazed earthenware pottery that is bisque fired and coated with an opaque glaze made from tin and lead oxides. This produces a white surface that obscures the red clay and is embellished with painted designs and natural forms.